Many years after the memorable trainwreck that was Ys III, Falcom had been rather quiet on the Ys front - in fact, the two Ys IV games weren't directly produced by Falcom themselves but rather by other studios (Tonkin House and Hudsonsoft).
Falcom decided it was high time to stop re-releasing Ys I&II over and over again and try to make a fresh, new take on the Ys series. It borrowed many assets from its predecessors, but it broke the barrier into 3D. This game was released for the PC in September 2003 as Ys VI: The Ark of Napishtim. It sold really well and Falcom wound up giving their Legend of Heroes series a reboot using the Ys VI engine as the initial release release of Sora no Kiseki FC (Trails in the Sky) in Japan a year later, which sold even better.
In 2005, Falcom decided to completely remake the old Ys III - a game they realized aged terribly (and honestly wasn't even that good to begin with), and in 2005 released Ys: The Oath in Felghana for the PC. A game that used the engine from Ark of Napishtim, and combines it with a better versed plot of Ys III, tweaked engine mechanics from Ys VI, and a completely new soundtrack. It is infinitely better than Wanderers from Ys and if you think otherwise you have the worst taste in pretty much everything.
Original Archived Let's Play available at the Let's Play Archive